research.m1stereo.tv/gitweb/ - melted/blob - src/framework/mlt_filter.h

   1 /**
   2  * \file mlt_filter.h
   3  * \brief abstraction for all filter services
   4  * \see mlt_filter_s
   5  *
   6  * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
   7  * \author Charles Yates <charles.yates@pandora.be>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #ifndef _MLT_FILTER_H_
  25 #define _MLT_FILTER_H_
  26
  27 #include "mlt_service.h"
  28
  29 /** \brief Filter abstract service class
  30  *
  31  * A filter is a service that may modify the output of a single producer.
  32  *
  33  * \extends mlt_service_s
  34  * \properties \em track the index of the track of a multitrack on which the filter is applied
  35  */
  36
  37 struct mlt_filter_s
  38 {
  39         /** We're implementing service here */
  40         struct mlt_service_s parent;
  41
  42         /** public virtual */
  43         void ( *close )( mlt_filter );
  44
  45         /** protected filter method */
  46         mlt_frame ( *process )( mlt_filter, mlt_frame );
  47
  48         /** Protected */
  49         void *child;
  50 };
  51
  52 #define MLT_FILTER_SERVICE( filter )            ( &( filter )->parent )
  53 #define MLT_FILTER_PROPERTIES( filter )         MLT_SERVICE_PROPERTIES( MLT_FILTER_SERVICE( filter ) )
  54
  55 extern int mlt_filter_init( mlt_filter self, void *child );
  56 extern mlt_filter mlt_filter_new( );
  57 extern mlt_service mlt_filter_service( mlt_filter self );
  58 extern mlt_properties mlt_filter_properties( mlt_filter self );
  59 extern mlt_frame mlt_filter_process( mlt_filter self, mlt_frame that );
  60 extern int mlt_filter_connect( mlt_filter self, mlt_service producer, int index );
  61 extern void mlt_filter_set_in_and_out( mlt_filter self, mlt_position in, mlt_position out );
  62 extern int mlt_filter_get_track( mlt_filter self );
  63 extern mlt_position mlt_filter_get_in( mlt_filter self );
  64 extern mlt_position mlt_filter_get_out( mlt_filter self );
  65 extern void mlt_filter_close( mlt_filter );
  66
  67 #endif